RDBMS upgrade 11g->12c

After tens of upgrades from 11g to 12.1.0.2 I summarize our experience in this small guide.

HOW TO USE THIS DOCUMENT

This is NOT script.

This is list of steps to guide you through upgrade process command by command. While this procedure fits most of environments, it's not possible to anticipate all possible circumstances. So be sure, you know what each step is doing, when you run it.

You can tailor this text to your environment by:

<DB_NAME> - replace by db_name of your database

<ORACLE_HOME_11g> - replace by $ORACLE_HOME of DB11g installation

<ORACLE_HOME_12c> - replace by $ORACLE_HOME of DB12c installation